/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.nan.samsung.qrsan.view;

import java.util.Collection;
import java.util.HashSet;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;

import com.google.zxing.ResultPoint;
import com.nan.samsung.qrsan.camera.CameraManager;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder
 * rectangle and partial transparency outside it, as well as the laser scanner
 * animation and result points.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class ViewfinderView extends View {

	private static final int[] SCANNER_ALPHA = { 0, 64, 128, 192, 255, 192, 128, 64 };
	private static final long ANIMATION_DELAY = 100L;
	private static final int OPAQUE = 0xFF;

	// private final Paint paint;
	private Bitmap resultBitmap;
	// private final int maskColor;
	// private final int resultColor;
	// private final int frameColor;
	// private final int laserColor;
	// private final int resultPointColor;
	private int scannerAlpha;
	private Collection<ResultPoint> possibleResultPoints;
	private Collection<ResultPoint> lastPossibleResultPoints;

	// This constructor is used when the class is built from an XML resource.
	public ViewfinderView(Context context, AttributeSet attrs) {
		super(context, attrs);

		// Initialize these once for performance rather than calling them every
		// time in onDraw().
		// paint = new Paint();
		// Resources resources = getResources();
		// maskColor = resources.getColor(R.color.viewfinder_mask);
		// resultColor = resources.getColor(R.color.result_view);
		// frameColor = resources.getColor(R.color.viewfinder_frame);
		// laserColor = resources.getColor(R.color.viewfinder_laser);
		// resultPointColor =
		// resources.getColor(R.color.possible_result_points);
		scannerAlpha = 0;
		possibleResultPoints = new HashSet<ResultPoint>(5);
	}

	@Override
	public void onDraw(Canvas canvas) {
		Rect frame = CameraManager.get().getFramingRect();
		if (frame == null) {
			return;
		}
		// int width = canvas.getWidth();
		// int height = canvas.getHeight();
		//
		// Draw the exterior (i.e. outside the framing rect) darkened
		// paint.setColor(resultBitmap != null ? resultColor : maskColor);
		// canvas.drawRect(0, 0, width, frame.top, paint);
		// canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
		// canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
		// paint);
		// canvas.drawRect(0, frame.bottom + 1, width, height, paint);

		if (resultBitmap != null) {
			// Draw the opaque result bitmap over the scanning rectangle
			// paint.setAlpha(OPAQUE); //设置 扫描框的外部是否显示扫描的背景
			// canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
		} else {

			// Draw a two pixel solid black border inside the framing rect
			// 2个像素的黑边框
			// paint.setColor(frameColor);
			// canvas.drawRect(frame.left, frame.top, frame.right + 1, frame.top
			// + 2, paint);
			// canvas.drawRect(frame.left, frame.top + 2, frame.left + 2,
			// frame.bottom - 1, paint);
			// canvas.drawRect(frame.right - 1, frame.top, frame.right + 1,
			// frame.bottom - 1, paint);
			// canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1,
			// frame.bottom + 1, paint);

			// Draw a red "laser scanner" line through the middle to show
			// decoding is active
			// paint.setColor(laserColor);
			// paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
			// scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
			// int middle = frame.height() / 2 + frame.top;
			// canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1,
			// middle + 2, paint);

			// Collection<ResultPoint> currentPossible = possibleResultPoints;
			// Collection<ResultPoint> currentLast = lastPossibleResultPoints;
			// if (currentPossible.isEmpty()) {
			// lastPossibleResultPoints = null;
			// } else {
			// possibleResultPoints = new HashSet<ResultPoint>(5);
			// lastPossibleResultPoints = currentPossible;
			// paint.setAlpha(OPAQUE);
			// paint.setColor(resultPointColor);
			// for (ResultPoint point : currentPossible) {
			// canvas.drawCircle(frame.left + point.getX(), frame.top +
			// point.getY(), 6.0f, paint);
			// }
			// }
			// if (currentLast != null) {
			// paint.setAlpha(OPAQUE / 2);
			// paint.setColor(resultPointColor);
			// for (ResultPoint point : currentLast) {
			// canvas.drawCircle(frame.left + point.getX(), frame.top +
			// point.getY(), 3.0f, paint);
			// }
			// }

			// Request another update at the animation interval, but only
			// repaint the laser line,
			// not the entire viewfinder mask.
			postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom);
		}
	}

	public void drawViewfinder() {
		resultBitmap = null;
		invalidate();
	}

	/**
	 * Draw a bitmap with the result points highlighted instead of the live
	 * scanning display.
	 * 
	 * @param barcode
	 *            An image of the decoded barcode.
	 */
	public void drawResultBitmap(Bitmap barcode) {
		resultBitmap = barcode;
		invalidate();
	}

	public void addPossibleResultPoint(ResultPoint point) {
		possibleResultPoints.add(point);
	}

}
